VOLVO
ECM-1A05 - Desired Engine Speed Signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
3 modelsC30 (2007–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2008–2009Engine B4184S11, B4184S8, B4204S3 only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3, B4204S4 only
What does this fault code mean?
The engine control module (ECM) receives information about the desired engine speed from the transmission control module (TCM). If the TCM has registered a fault in the speed signal, it sends a fault message to the engine control module, which then stores the code. This is a follow-on fault: the root fault lies in the TCM and must be fixed first, and only then can the code be cleared.
Possible causes
- The root fault lies in the transmission control module (TCM)
What you can do
- 1If you have a diagnostic tool, read the fault codes in the transmission control module (TCM) and fix those first
- 2Clear the fault code in the engine control module only after the root fault is fixed, then check that it does not return
- 3Have a workshop troubleshoot the transmission control module and the speed signal if the fault remains
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.